4.14 dsktune command fails with an unsupported error message

The dsktune command, which is included with the 389 Directory Server base package (389-ds-base) fails with the following error message notifying you that the system does not have support for cx16, which is a feature commonly available on x86-64 platforms:

ERROR: This system does not support CMPXCHG16B instruction (cpuflag cx16).
nsslapd-enable-nunc-stans must be set to "off" on this system.
In a future release of Directory Server this platform will NOT be
supported.

ERROR  : The above errors MUST be corrected before proceeding.

The dsktune command checks that a system meets requirements and can provide helpful information pertaining to onfiguration, but it is not required to run the 389 Directory Server.

(Bug ID 26861135)